Metal cord for reinforcing rubber article

Abstract

The invention can improve rubber permeability and a fatigue resistance in a metal cord in a layer structure. There is formed layer structure in which a sheath ( 3 ) constituted by 1 to 6 filaments (Fb) is formed around a core constituted by 1 filament (Fa). The filament (Fa) is constituted by a waved filament ( 5 ) waved in a two-dimensional wave shape in a state before being bundled, and is twisted with the sheath while applying the torsion so as to be formed in a three-dimensional wave shape within a cord.

What is claimed is:  
     
         1 . A metal cord for reinforcing a rubber article formed comprising: 
 a core formed of one filament; and    a sheath formed of 1 to 6 filaments arranged around the core,    wherein said filament of the core is formed of a waved filament waved in a two-dimensional wave shape having crest portions and trough portions in a repeated manner, in a state before being bundled, and is twisted with said sheath while applying the torsion so as to be formed in a three-dimensional wave shape within a cord.    
     
     
         2 . The metal cord for reinforcing a rubber article as claimed in  claim 1 , wherein a diameter d of said filament is between 0.15 and 0.50 mm and substantially the same as that of the filament of said sheath.